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Evapotranspiration
Evapotranspiration, or ET, is a calculated value that uses weather conditions to estimate the amount of water lost from the soil through evaporation due to weather and due to the transpiration of water by plants.The base ET calculation uses wind speed, temperature, solar irradiance, relative humidity, and barometric pressure and is calculated for "cropped" grass" which is essentially a well-water lawn that completely shades the ground surface.
More information can be found in this Davis Instruments PDF , in the Evapotranspiration section on page 28-15:
Derived Variables in Davis Weather Products
Weather Station Installation and
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